The server provides 4 tools for HED validation with reasonable naming and explicit schemas. However, there are significant gaps in parameter descriptions, missing output schema documentation, and no evidence of error handling guidance. Tool names follow verb_noun conventions (validate*, get*) which is good, but parameter documentation is inconsistent and sparse. The server operates on READ_ONLY resources but lacks proper error recovery guidance and actionable error messages. Descriptions are adequate but brief (10-70 chars on average), falling below the 50-200 char ideal for LLM optimization.

• Expand tool descriptions to 100-200 chars. Example: 'validateHedString: Validates a HED annotation string against a specified schema version. Returns validation errors and optional warnings. Use this first to check individual HED tags before processing bulk data with validateHedTsv or validateHedSidecar.'
• Document hedVersion format explicitly. Specify: 'hedVersion must be in format VERSION (e.g., 8.4.0) or LIBRARY_VERSION,LIBRARY_VERSION (e.g., lang_1.1.0, score_2.1.0). If invalid, the tool returns an error with available versions.'
• Add explicit output schema documentation. Example for validateHedString: 'Returns: {isValid: boolean, errors: [{message: string, severity: "error"|"warning"}], checksum: string}'. Without this, agents cannot extract validation details.
• Add error handling guidance in tool descriptions. Example: 'If validation fails, errors array contains human-readable messages indicating which HED tags are invalid and why. Common errors: invalid vocabulary, duplicate parentheses, missing definition. Call getFileFromPath to inspect source HED if errors are unclear.'
• Specify 'definitions' parameter format. Example: 'Array of definition strings, each in format "DefinitionName: tag1, tag2, ..." (e.g., ["MyDefinition: (Action, (Movement, (Hand))), (Object, (Hand-held))"]). Invalid definitions produce errors in the results.'
• Document getFileFromPath security constraints. Add: 'filePath must be an absolute path within the examples/ directory. Paths outside this root are rejected. Symlinks are resolved and checked against the same boundary.'